Exchange NDR Logs

By mbarrett ·
On my exchange server, I keep getting alot of non delivery reports in the logs with strange email addresses, with Event ID either 3030 or 3018.

A non-delivery report with a status code of 4.0.0 was generated for recipient rc822; (Message-ID <
Unless I'm mistaken, this is from spam, but I've turned off open relay. What am I missing?

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